The craft brewer plans an early December opening for an indoor counterpart to the outdoor space — in Roslindale’s substation building. The new space, which will be open five days a week, will have open seating, a rotating draft list, and be available for certain private events.

The announcement follows the fan-favorite beer company’s launch of an open-air beer garden on the Greenway this summer, which turned out to be a hit with locals and tourists alike.

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“We had a killer time with the Garden on the Greenway this summer so we jumped at the chance to bring Trillium to another Boston neighborhood,” Trillium co-owner Esther Tetreault said in a statement. “The substation is such a unique and iconic space, in a welcoming neighborhood, making Roslindale a perfect winter home for the Trillium Garden.”

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“Where Trillium goes, its fans follow. I’m eager to welcome the newcomers that will discover Roslindale’s existing mix of vibrant restaurants and retail options,” she wrote in a press release.

A precise opening date hasn’t been nailed down yet, company officials said.

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The Roslindale substation was built in 1911 by the Boston Elevated Railway Co. when alternating electrical current systems were cutting-edge, but it went dark in 1971. Following a $4.8 million restoration project in 2014 — involving a collaboration between Historic Boston Inc. and the developer Peregrine Group — Craft Beer Cellar opened in the building’s lower level in January 2017, ending decades of dormancy.

Trillium’s Roslindale project is just its latest expansion. Since its launch in Boston’s Fort Point in 2013, the company has gained a loyal fan base, and the website RateBeer recently named it the third-best brewery in the world. Trillium opened a second brewery and tap room in Canton in December 2015, and although the Fort Point location at 369 Congress St. only sells beer to go, that’s changing soon. Trillium’s owners plan to open a 16,000 square-foot space
over two floors at 47 Farnsworth St. by the end of 2018. It will feature a tap room and restaurant with seating for 400 people. The company also hopes to add a patio and roof deck.